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LEAD DEFINITIONS E-3
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Table E-2. EIA RS-232D (V.28) LEADS/DEFINITIONS
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PIN EIA CCITT LEAD DESCRIPTION
NO. INTERCHANGE EQUIVALENT (FUNCTION)
CIRCUIT CIRCUIT
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1 — — Shield
2 BA 103 Transmitted Data
3 BB 104 Received Data
4 CA 105 Request to Send
5 CB 106 Clear to Send
6 CC 107 DCE Ready
7 AB 102 Signal Ground/Common Ground
8 CF 109 Received Line Signal Detected
9 — — Reserved for Testing,
(+P) Transmit Current Loop Data
10 — — Reserved for Testing
11 — — Unassigned
12 SCF 122 Secondary Received Line Signal
Detect—(Speed Mode Indication)
13 SCB 121 Secondary Clear to Send
14 SBA 118 Secondary Transmitted Data
15 DB 114 Transmitter Signal Element Timing
(DCE Source)
16 SBB 119 Secondary Received Data
17 DD 115 Receiver Signal Element Timing
(DCE Source)
18 LL — Local Loopback
19 SCA 120 Secondary Request to Send
20 CD 108/2 DTE Ready
21 RL/CG 140/110 Remote Loopback/Signal Quality Detector
22 CE 125 Ring Indicator
23 CH/CI 111/112 Data Signal Rate Selector
(DTE/DCE Source)
24 DA 113 Transmitter Signal Element Timing
25 TM Test Mode
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